Nawazuddin Siddiqui shared a heartfelt message for his sister, who he says has been battling breast cancer since she was 18.

Image courtesy: Nawazuddin Siddiqui/ Twitter

Actor Nawazuddin Siddiqui on Saturday shared a heartfelt message for his sister, who he says has been battling breast cancer since she was 18.

The actor posted a birthday message acknowledging his sister's courage.

"My sister ws diagnosed of advanced stage (of) breast cancer at 18 but it was her will power and courage that made her stand against all the odds. She turns 25 today and still fighting," Nawazuddin tweeted.